Genus Amphicteis Grube, 1850

Type species.

Amphitrite gunneri Sars, 1835

Diagnosis.

Prostomium with middle lobes as paired longitudinal glandular ridges and nuchal organs as transverse or oblique nuchal ridges. Buccal tentacles usually smooth. Four pairs of cirriform branchiae usually arranged in two transverse rows. Notochaetae in segment II present and usually developed as strong paleae. Seventeen thoracic chaetigers from segment III with notopodia bearing tuberculate ventral cirri. Modified notopodia and intermediate uncinigers absent. Fourteen thoracic uncinigers with uncini-bearing neuropodial tori (usually with small dorsal papilla) from segment VI. Usually 15 abdominal uncinigers present. Abdominal uncinigers with rudimentary notopodia and uncini-bearing pinnules with digitiform or cirriform dorsal cirri. Usually one pair of anal cirri present, inserted laterally on pygidium. Thoracic and abdominal uncini with a single row of teeth.